Derivatives of tiazol with fungicide activity.

Compounds having the general formula (I): in which: - R1 represents a hydrogen atom; a C1-C6 alkyl or haloalkyl group, linear or branched; a C2-C6 alkenyl or haloalkenyl group; a C2-C6 alkynyl or haloalkynyl group; a C3-C6 cycloalkyl group; an aryl group; a heteroaryl group; a heterocyclic group; a halogen atom; - R2 represents a hydrogen atom; a halogen atom selected from chlorine, fluorine, bromine or iodine; a C1-C6 alkyl or haloalkyl group, linear or branched; a linear or branched C2-C6 alkenyl or haloalkenyl group; a linear or branched C2-C6 alkynyl or haloalkynyl group; a C3-C6 cycloalkyl group; a C1-C6 alkoxy or haloalkoxy group, linear or branched; a C1-C6 alkylthio or haloalkylthio group, linear or branched; a C3-C6 cycloalkoxy group; a cyano group; a linear or branched C2-C8 alkoxycarbonyl group; an aminocarbonyl group; a linear or branched alkylaminocarbonyl or C2-C8 group; a linear or branched C3-C15 dialkylaminocarbonyl group; a linear or branched C2-C8 alkylcarbonyl group; an aryl group; or a heteroaryl group; a heterocyclic group; - R3 and R4 independently represent a linear or branched C1-C4 alkyl group.